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2010-11-07 14:35:19
CCNA Sybex Ch1 Written

CCNA Sybex Ch1 Written
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  1. 1. Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?
    The Application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses).
  2. 2. Which layer is responsible for converting data packets from the Data Link layer into electrical signals?
    The Physical layer takes frames from the Data Link layer and encodes the 1s and 0s into a digital signal for transmission on the network medium.
  3. 3. At which layer is routing implemented, enabling connections and path selection between two end systems?
    The Network layer provides routing through an internetwork and logical addressing.
  4. 4. Which layer defines how data is formatted, presented, encoded, and converted for use on the network?
    The Presentation layer makes sure that data is in a readable format for the Application layer.
  5. 5. Which layer is responsible for creating, managing, and terminating sessions between applications?
    The Session layer sets up, maintains, and terminates sessions between applications.
  6. 6. Which layer ensures the trustworthy transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, ordered delivery of frames, and flow control?
    PDUs at the Data Link layer are called frames. As soon as you see frame in a question, you know the answer.
  7. 7. Which layer is used for reliable communication between end nodes over the network and provides mechanisms for establishing, maintaining, and terminating virtual circuits; transport-fault detection and recovery; and controlling the flow of information?
  8. 8. Which layer provides logical addressing that routers will use for path determination?
    The Network layer provides logical addressing, typically IP addressing and routing.
  9. 9. Which layer specifies voltage, wire speed, and pinout cables and moves bits between devices?
    The Physical layer is responsible for the electrical and mechanical connections between devices.
  10. 10. Which layer combines bits into bytes and bytes into frames, uses MAC addressing, and provides error detection?
    • The Data Link layer is responsible for the framing of data packets.
    • 11. Which layer is responsible for keeping the data from different applications separate on the network?
    • 11. The Session layer creates sessions between different hosts’ applications.
  11. 12. Which layer is represented by frames?
    12. The Data Link layer frames packets received from the Network layer.
  12. 13. Which layer is represented by segments?
    13. The Transport layer segments user data.
  13. 14. Which layer is represented by packets?
    14. The Networklayer creates packets out of segments handed down from the Transportlayer.
  14. 15. Which layer is represented by bits?
    15. The Physical layer is responsible for transporting 1s and 0s in a digital signal.
  15. 16. Put the following in order of encapsulation: Packets, Frames, Bits, Segments
    16. Segments, packets, frames, bits
  16. 17. Which layer segments and reassembles data into a data stream?
    17. Transport
  17. 18. Which layer provides the physical transmission of the data and handles error notification, network topology, and flow control?
    18. Data Link
  18. 19. Which layer manages device addressing, tracks the location of devices on the network, and determines the best way to move data?
    19. Network
  19. 20. What is the bit length and expression form of a MAC address?
    20. 48 bits (6 bytes) expressed as a hexadecimal number
  20. This device sends and receives information about the Network layer.
  21. This layer creates a virtual circuit before transmitting between two end stations.
  22. This layer uses service access points.
    Data Link (LLC sublayer)
  23. This device uses hardware addresses to filter a network.
    Bridge or switch
  24. Ethernet is defined at these layers.
    Data Link and Physical Transport
  25. This layer supports flow control and sequencing.
  26. This device can measure the distance to a remote network.
  27. Logical addressing is used at this layer.
  28. Hardware addresses are defined at this layer.
    Data Link (MAC sublayer)
  29. This device creates one big collision domain and one large broadcast domain.
  30. This device creates many smaller collision domains, but the network is still one large broadcast domain.
    Switch or bridge
  31. This device can never run full duplex
  32. This device breaks up collision domains and broadcast domains.